What are These Sizes For? Many people keep the same wheels and tires that came with their vehicle. Others choose to add a level of personalization and enhance performance of their vehicle by installing new wheels and tires. This is commonly referred to as "Plus Sizing". When installing wheels that are 1" larger in diameter than the original wheels, this is called "Plus One". A wheel that is 2" larger would be "Plus Two", and so on. Since the original tires will not fit the larger wheels, new tires must be installed in the appropriate size. A "Plus Zero" application refers to installing a different size tire, say, slightly wider than the original tires, but for the original equipment wheel diameter. Depending on how much wider the tires are, this may require the purchase of new wheels.
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